Arrangement for operating engine valve gear sleeves



A. KEGRESSE May 12, 1936.

ARRANGEMENT FOR OPERATING ENGINE VALVE GEAR SLEEVES Filed Oct. 12, 1933 Egg:

m ATTORNEY Patented May 12, 1936 ARRANGEMENT FOR ()PERATING ENGINE VALVE GEAR SLEEVES Adolphe Kgresse, Courbevoie, France Application October 12, 1933, Serial No. 693,382 In France October 13, 1932 3 Claims. (01. 123-75) In known engines, the reciprocating valve gear A cam shaft l3 carrying a cam I4 is provided sleeves are generally operated by rocking levers at the upper portion 6 of the small cylinder 5. or connecting rods, and in all cases, the said The operation of the device is easy to underlevers or rods are connected to the sleeve by stand. It has been seen that the sleeve I is urged m'eans of a pin mounted on two lugs integral with upwardly under the action of the spring H. 5

the sleeve itself. Under the action of the cam M on the shaft 13, These arrangements possess the following the attachment comprising the small cylinder 5, serious disadvantages: fork 9 and sleeve I, will be moved downwardly to 1. By acting on the sleeve over a small portion move upwardly again under the action of the 10 of its circumference, they have a tendency to spring II, as soon as the action of the cam l4 has 10 cause it to jam in the cylinder, and to deform it ceased to be effective.

when it has thin walls. The clamp l0 fixing the fork 9 on the small 2. The sleeves are expensive to construct on accylinder 5, enables the latter to be adjusted relacount of the lugs which necessitate complicated tively to the sleeve.

milling and drilling operations. Sleeves having a This arrangement may be applied equally well 15 very thin wall, indispensable for obtaining high to sleeve-valves and to port sleeves. For the speeds and efficiencies, are almost impossible to latter, other modifications may be provided of construct and in any case are very expensive. which Figure 3 provides an example.

On the other hand, in sleeve-valve engines, it As will be seen in Figure 3, the cam shaft i3 is important that the said sleeve valve shall be of Figure 1 is replaced by a crank-shaft l5 op- 20 able to rotate in order to facilitate its grinding crating the small cylinder 5 by means of a conand to preserve its fluid-tightness. In sleeves necting rod [6. with lugs this is impossible. In the two devices described, it will be seen The present invention relates to an arrangethat the sleeve I cannot be subjected to any ment for Operating engine valve gear Sleeves jamming effects, since its movement is controlled 25 w h e mi the serious isa vant along an axis 4 (Figures 1 and 3) strictly parallel enumerated in the foregoing. t it In t accompanying drawingi Furthermore, in its movement the sleeve is Figure 1 Shows in sectional elevation and by stressed on at least half of its periphery. It Way of example, an Operating device according would even be possible by attaching a half-collar to invemionto the fork, to cause the latter to act upon the Figure 2 1s a horlzontal sectional view of Figure entire periphery f the groove 3 Practice, 1, taken along the lme ever, shows that this addition is unnecessary. Figure 3 shows a modification of Figure 1. It will also be Seen that an advantageous As will be Seen iron? Figure h sleeve I m fect of the groove 3 is to reinforce the lower por- Jects 3 by Its base Whlch tion of the sleeve and to prevent it from being campuses clrc ar groove deformed. This renders it possible to construct Parallel to the axis of the cylinder 2 and on an I axis 4 there is provided a small hollow cylinder g g g ggg actual sleeve Wlth wall as thm 40 40 5 closed at its upper end 6. The small cylinder 5 can move in a vertical direction in two bosses fAnotiler p gfi g fi ifi h $3 7 and 8, which may be cast on the cylinder block. 0 S V8 15 116 0 e are at Between the bosses 1 and 8, the small cylinder groove the sleeve'Yalve 15 to 5 carries a fork 9, which is fixed on cylinder 5, movemfant of rotatlon a Its own axls hke for example by means of a clamping device In. an ordinary valve. This W111 enable the wear 45 The two branches of the fork 9 engage the circuprodsced by the piston on the Sleeve to be lar groove 3 of the sleeve. preciably reduced by the constant changing of Astrongly compressed spring II is located withthe portions of Surface in Contact, and W111 in the sm u cylinder 5, on d of t spring prove the fluid-tightness of the seat of the sleevebears against the base I2 fixed against the lower ve by a sli C r r rubbi g at the moment 50 part of the boss 8, and the other end bears of making a against the end 6 of the small cylinder 5. The Normal grinding of the sleeve-valve will be effect of the spring II is to push the unit compossible. Finally, apoint whichisalso important, prising the cylinder 5, fork 9 and sleeve I, upthe machining of the sleeve will only necessitate Wardly. operations excluding milling and drilling. Its 55 cost price will therefore be reduced to a I claim:

1. In a reciprocating engine having a crankshaft, a piston connected thereto, a cylinder in which said piston reciprocates and a sleeve valve surrounding the piston, means for reciprocating said sleeve valve comprising a reciprocating element, means for supporting and guiding said element to confine its reciprocation to a path parallel to the axis of the sleeve valve, means for reciprocating said. element in timed relation to said crank-shaft, said sleeve having a guideway extending about its circumference, and means rigidly carried by said reciprocating element and adjustable thereon in the direction of reciprocation for engaging at least two substantially diametrically opposed points on said guideway for imparting reciprocating movement of said element to said sleeve.

2. In a reciprocating engine having a crankshaft, a piston connected thereto, a cylinder in which said piston reciprocates and a sleeve valve surrounding the piston, means for reciprocating said sleeve valve comprising a reciprocating element, means for supporting and guiding said element to confine its reciprocation to a path parallel to the axis of the sleeve valve, means for reciprocating said element in timed relation to said crank-shaft, said sleeve having a circum ferential channel provided on its outer surface, and a fork-like member rigidly carried by said reciprocating element and adjustable thereon in the direction of reciprocation with its prongs engaging at least two substantially diametrically opposed points in said channel for imparting reciprocating movement of said element to said sleeve.

3. In a reciprocating engine having a crankshaft, a piston connected thereto, a cylinder in which said piston reciprocates and a sleeve valve surrounding the piston, means for reciprocating said sleeve valve comprising a reciprocating element, means for supporting and guiding said element to confine its reciprocation to a path parallel to the axis of the sleeve valve, means for reciprocating said element in timed relation to said crank-shaft, said sleeve having a circumferential channel provided on its outer surface, and a fork-like member rigidly carried by said reciprocating element and adjustable thereon in the direction of reciprocation with its prongs engaging at least two substantially diametrically opposed points in said, channel for imparting reciprocating movement of said element to said sleeve, the engagement between said fork-like member and the sleeve beingsuch as to afiord free rotation of the sleeve about its axis.

ADOLPI-E KEGRESSE. 

